Abstract: Maize rough dwarf disease caused by Rice black-streaked dwarf virus(RBSDV) is one of the most important diseases on maize production in North China.Studies were carried out to measure and calculate each of the healthy and infected plant height and the yield of 1003 plants of 3 cultivars.The result showed that disease severity was closely correlated to the plant height and yield.When diseased plant heights were 1,4/5,2/3,1/2,1/3 of the healthy plant,disease severities were graded from 0,1,2,3 to 4;and the yield losses ranged from 0%,25%,50%,75% to 100% respectively.By analyzing the data of disease index and yield loss from 10 cultivars with SSPS,a regression equation was established,which is Y=-0.253+1.02X(Y:yield loss;X:disease index).The equation was validated with the data from 16 cultivars.The result supported the feasibility of the equation to predict the yield loss caused by maize rough dwarf disease in production.

Key words: Maize rough dwarf disease, Disease grading criterion, Disease index, Yield loss

CLC Number: 

• S435.13